オーステナイトに固溶した窒素の活量におよぼすニッケルの影響

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  • Effects of Nickel on the Activity of Nitrogen in Austenite
  • オーステナイト ニ コヨウ シタ チッソ ノ カツリョウ ニ オヨボス ニッケル ノ エイキョウ

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The nitrogen solubility in austenite was measured on Fe-Ni binary alloy in order to study the effect of nickel on the activity of nitrogen in austenite and to obtain the interaction parameter of nickel. Samples used were the Fe-Ni alloys with Ni content up to 100% and the experimental temperatures were 1050° and 1250°C. Ni increases the activity of nitrogen in austenite and the interaction parameter εN(Ni) is 4.5 at 1050°C and 4.1 at 1250°C.<BR>The nitrogen solubilities in pure γ-iron under various partial pressure of nitrogen were measured at 1150°C and result shows that Sieverts’ law is obeyed for nitrogen absorption in γ-iron.<BR>A close relationship between the interaction parameters and the atomic number of the added elements was observed and it was also found that the absolute value of the interaction parameter was decreased with the increase in temperature.

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